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Proceedings Paper

Optimized thermal imaging with a singlet and pupil plane encoding: experimental realization
Author(s): Gonzalo Muyo; Amritpal Singh; Mathias Andersson; David Huckridge; Andy Harvey
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Paper Abstract

Pupil plane encoding has shown to be a useful technique to extend the depth of field of optical systems. Recently, further studies have demonstrated its potential in reducing the impact of other common focus-related aberrations (such as thermally induced defocus, field curvature, etc) which enables to employ simple and low-cost optical systems while maintaining good optical performance. In this paper, we present for the first time an experimental application where pupil plane encoding alleviates aberrations across the field of view of an uncooled LWIR optical system formed by F/1, 75mm focal length germanium singlet and a 320x240 detector array with 38-micron pixel. The singlet was corrected from coma and spherical aberration but exhibited large amounts of astigmatism and field curvature even for small fields of view. A manufactured asymmetrical germanium phase mask was placed at the front of the singlet, which in combination with digital image processing enabled to increase significantly the performance across the entire field of view. This improvement is subject to the exceptionally challenging manufacturing of the asymmetrical phase mask and noise amplification in the digitally restored image. Future research will consider manufacturing of the phase mask in the front surface of the singlet and a real-time implementation of the image processing algorithms.

Paper Details

Date Published: 29 September 2006
PDF: 9 pages
Proc. SPIE 6395, Electro-Optical and Infrared Systems: Technology and Applications III, 63950M (29 September 2006); doi: 10.1117/12.689765
Show Author Affiliations
Gonzalo Muyo, Heriot-Watt Univ. (United Kingdom)
Amritpal Singh, Saab Bofors Dynamics AB (Sweden)
Mathias Andersson, Saab Bofors Dynamics AB (Sweden)
David Huckridge, QinetiQ (United Kingdom)
Andy Harvey, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 6395:
Electro-Optical and Infrared Systems: Technology and Applications III
Ronald G. Driggers; David A. Huckridge, Editor(s)

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